Abrasive wheel dressing tools



March 20, 1956 KARPOVlTZ 2,738,784

ABRASIVE WHEEL DRESSING TOOLS Filed March 25, 1952 3 Sheets-Sheet l INVENTOR. F RAN/f K/l/FPOV/TZ A TTORNE Y F. KARPOVITZ ABRASIVE WHEEL DRESSING TOOLS March 20, 1956 3 Sheets-Sheet 2 Filed March 25, 1952 RPOV/TZ BY fiMJa/m/ INVENTOR. F RANK KA ATTORNEY March 20, 1956 Filed March 25, 1952 F. KARPOVITZ ABRASIVE WHEEL DRESSING TOOLS 3 Sheets-Sheet 3 INVENTOR. FRANK AA/aPo w TZ ATTORNfY United StatesPatentO ABRASIV E WHEEL DRESSING TOOLS Frank Karpovitz, Providence, R. I., assignor to Anton Smit & Co. Inc., New York, N. Y., a corporation of New York Application March 25, 1952, Serial No. 278,455 14 Claims.. or. 125-511 This invention relates to abrasive wheel dressing tools, and more particularly to an improved holder for supporting a diamond pointed nib in dressing contact with the surface of an abrasive wheel to be dressed and having mechanism for selectively orienting or indexing the nib so that a sharp diamond point is at all times presented to the wheel surface.

In the precision grinding and polishing of various metal parts, it is desirable to periodically true up the wheel surface and sharpen the abrading surface thereof. The carbon, heart or ballas, commonly referred to as an industrial diamond, which provides the dressing point for the nib, will wear and develop a fiat after continued dressing action. In order to maintain the abrading surface of the wheel sharp and true, it is necessary that a sharp diamond point or edge be presented at all times for contact with the wheel surface being dressed. To insure presentation of a sharp point to the wheel surface, it is necessary that the nib be periodically oriented or indexed through a predetermined angle so that the worn wheel contacting surface of the diamond is replaced by a sharp diamond point which has been symmetrically sharpened by previous dressing operations.

Nib indexing has heretofore been effected by rotating the diamond pointed nib to alternate indexing stations so that the indexing distance is double the distance between consecutive stations! By such indexing procedure, a sharp diamond point can be presented at each station when the nib has been rotated through two complete revolutions.

In nib supporting holders as heretofore constructed, one or more nib clamping set screws or bolts must be first manually manipulated to loosen the nib before indexing orientation of the nib can be effected. After the indexing adjustment has been accomplished, the nib clamping set screws, bolts or nuts must be re-tightened to again secure the nib in fixed position. Considerabletime and attention of the wheel dressing operator must be devoted to manually unclamping, indexing and reclamping the nib at the selected indexing station Which accordingly slows up the wheel dressing operation. Nib supporting and indexing holders as heretofore constructed are also bulky in size and shape, and difficulty is constantly encountered in mounting the holder on grinding machines having lim ited space for the reception of the wheel dressing tool.

An object of this invention is to provide an improved nib supporting and indexing holder wherein the nib is supported in a chatterproof manner, and which is further constructed to effectuate the unlocking, indexing and relocking of the nib in automatic sequence by the simple manipulation of an indexing handle.

Another object of this invention is to provide an improved nib supporting and indexing holder whose operating parts are thoroughly sealed against the entry of grinding dust, and which permits nib removal and replacement in minimum time and with minimum effort.

A further object of this invention is to provide animproved wheel dressing tool which can be manufactured at low cost from relatively few and simple parts, which can be easily assembled and disassembled, which is sturdy,

durable and compact in construction, which may be mounted within cramped locations on the grinding machine, and which is operative to effect substantially automatic unlocking, indexing and relocking of the diamond pointed nib with minimum attention from the grinding machine operator.

Other objects and advantages of this invention will become apparent as the disclosure proceeds. 1

Although the characteristic features of this invention will be particularly pointed out in the claims, the invention itself, and the manner in which it may be carried out, may be better understood by referring to the following escription taken in connection with the accompanying drawings, in which Fig. 1 is a side elevational view of the indexing wheel dresser mounted on the reciprocating footstock of a grinding machine and with the diamond pointed nib held in wheel dressing position;

Fig. 2 is an enlarged transverse sectional view of the wheel dresser as the same would appear when viewed along line 2-2 of Fig. 1, this view showing certain parts of the nib indexing mechanism in locked operating position;

Fig. 3 is another enlarged transverse sectional view of the wheel dresser taken along line 22 of Fig. 1 as the same would appear after the nib has been unlocked and rotated to an advanced indexing station;

Fig. 4 is an enlarged longitudinal sectional view of the wheel dresser as the same would appear when viewed along line 4-4 of Fig. 2;

Fig. 5 is another enlarged longitudinal sectional view of the wheel dresser as the same would appear when viewed along line 55 of Fig. 2;

Fig. 6 is still another enlarged longitudinal sectional view of the wheel dresser as the same would appear when viewed along line 6-43 of Fig. 2;

Fig. 7 is a side elevational view of the stationaryhousing member which contains the major parts of the indexing mechanism of the wheel dresser;

Fig. 8 is an end view of the housing member shown in Fig. 7;

Fig. 9 is an enlarged perspective view of the nib supporting indexer whose tubular body is contained within the housing member of the assembled wheel dresser;

Fig' 10 is an enlarged perspective view of the indexing collar which telescopes over the tubular body of the nib supporting indexer and is contained within the housing member of the assembled wheel dresser;

Fig. 11 is an enlarged perspective view of the cam washer which is positioned adjacent the cam face of the I indexing collar of the assembled wheel dresser; and

Fig. 12 is a perspective view of the warped spring washer which operates to resiliently retain the cam face of the cam washer against the cam face of the indexing collar of the assembled wheel dresser.

Similar reference characters refer to similar parts throughout the several views of the drawings and the specification.

In general organization, this improved indexing wheel dresser comprises a removable nib 10 having a diamond point 13 mounted in the exposed operating end thereof. The nib it is removably mounted on a supporting shank 29 whose longitudinal axis is in alignment with the nib stem. The nib stem extends through a rotatable nib supporting indexer 50 which is removably secured to the nib shank by a nib locking member 70. An indexing collar 60 telescopes over the tubular body 51'of the nib supporting indexer and is provided with a pivotally mounted spring pressed pawl 64 designed to selectively engage the teeth formed in the tubular body of the nib supporting indexer 50. A laterally extending indexing handle 45 is connected to the indexing collar 60 which may be oscillated through a predetermined angle to thereby effect indexing orientation of the nib supporting indexer 50 and the nib supported thereby. A stationary housing member 30 encloses the indexing collar 60 and is provided with a wedge face 34 which frictionally engages a corresponding cam face 55 of the nib supporting indexer 50 to releasably lock the nib supporting indexer 50 and the nib 10 in indexed position.

The stationary housing 30 is removably connected to the stationary supporting shank 20 by an internally threaded ring nut 25, and an oscillatible cover ring 4%) embraces the stationary housing 30 to seal the indexing mechanism contained within the housing from dust entry. A non-rotatable cam washer 89 is positioned within the housing member 39 and is pressed against the cam face of the indexing collar 60 by means of a warped spring washer 90 to thereby normally maintain the wedge face 34 of the housing member 30 in Wedge-locking position against the adjacent internal cam face 55 of the nib supporting indexer 50.

In more specific detail, the diamond supporting nib 10, designed to be removably mounted in this improved holder, has a head 11 presenting a tapered end face 12 whose apex receives a selected diamond 13 firmly held in position by a bonding matrix 14 as shown in Fig. 4. A cylindrical neck portion 15 extends from the head portion 11 in axial alignment with the mounted diamond 13. An externally threaded stem portion 16 of somewhat less diameter than the cylindrical neck portion 15 extends from the neck portion and terminates in a secondary stem portion 17 of less diameter than the threaded stem portion 16. The head portion 11 of the nib may be of any form and size and may be provided with flat faces 18 for wrench application.

The nib 10 is supported from a normally fixed supporting shank 20 which has a shank stem 21 of any desired length and diameter whose attaching end is provided with a disc shaped head section 22 having a threaded periphery 23 as shown in Figs. 4- and 5. The attaching end of the supporting shank 2 is provided with an axial socket 24 into which the secondary stem portion 17 of the nib 10 may be snugly inserted.

A ring nut 25 provided with internal threads 26 is designed to be threaded over the external threads of the head section 22 to thereby detachably secure the supporting shank 20 to the normally stationary housing member fit). The exterior surface of the ring nut 25 may be knurled or provided with suitable flat faces 27 for wrench application so that the ring nut 25 may be readily manipulated to permit removal of the supporting shank 20 from the assembly.

The stationary housing member 3%, as shown in Figs. 4, 7 and 8, may be made as a casting, forging or a machined metal part and presents a tubular body 31 having a relatively heavy inturned flange portion 32 at one end thereof whose inner bore 32' has a smooth bore surface into which the tubular body portion 51 of the nib supporting indexer 5% is snugly inserted. The flange portion 32 terminates in a forwardly projecting nose portion 33 presenting an outward tapered wedge face 34. The other end of the tubular body portion 31 presents a tubular tail portion 35 which is externally threaded to receive the ring nut 25 as shown in Fig. 4. The tubular tail portion 35 has a pair of diametrically arranged longitudinally extending slots 35' cut therein as shown more particularly in Figs. 7 and 8. The tubular body portion 31 also has a semi-circular slot 36 cut circnmferentially through the body wall thereof for a predetermined angular distance, the ends of the slot 36 being closed to define limit stops 36 and 36". The slot 36 provides the opening through which the indexing handle 45 extends. The tubular body portion 31 and inturned flange portion 32 of the housing member 30 define an internal pocket cavity 37 designed to snugly receive the pawl collar 60.

'An oscillatable cover ring 40 embraces the tubular body portion 31 of the stationary housing member 30 and covers the semi-circular slot 36 therein. The cover ring 40 has a sealing lip 41 at one end thereof which seats over a raised sealing rim 38 extending around the body portion 31 of the housing member, and a similar sealing lip 42 at the other end thereof is designed to interfit with a recessed shoulder 29 formed in the adjacent end of the ring nut 25. The sealing lips 41 and 42 thus provide an effective seal excluding the entry of grinding dust to the indexing mechanism contained within the housing member 30.

A removable indexing handle 45 as shown in Figs. 2, 3 and 4 is provided with a threaded shank portion 46 which is threaded into a threaded hole 43 extending radially through the cover ring 40. The indexing handle has an end extension 47 which extends through the semicircular slot 36 in the body portion 31 of the housing member 3% and its terminal end extends into a radial hole 62 in the indexing collar 60 so that the collar may be oscillated by the indexing handle 45. An internally threaded locknut 48 secures the indexing handle 45 in fixed position to the cover ring 40 and yet permits convcnient removal of the indexing handle as desired.

The nib supporting indexer 50 as shown in Figs. 4 and 9, may also be made as a casting, a forging or as a machined part, and presents a tubular body having a neck section 51 and a tail section 52. The neck section 51 has a smooth bore 51' designed to snugly receive the neck portion 15 of the nib. The tubular neck section 51 presents an outwardly flared flange section 53 having an outer abutment face 54 designed to frictionally abut against the base face 11 of the diamond supporting head 11 of the nib. The outwardly flared flange section 53 also presents an internal cone-shaped cam face 55 against a which the tapered wedge face 34 of the housing member 30 is designed to seat as shown in Fig. 4. The tubular neck section 51 of the nib supporting indexer 50 is snugly journaled within the axial bore 32' defined by the inturned flange portion 32 of the housing member 30.

As shown in Figs. 2, 3, 4 and 7, the tail section 52 of the nib supporting indexer 50 is of slightly less diameter than the neck section 51 thereof and provides a bearing surface for the indexing collar as tclcscoped thereover. The outer surface of the tubular tail sec tion 52 has seven tangentially milled recesses 56 in the outer surface thereof terminating in radial abutments 57 defining the seven radial indexing teeth at the indexing stations 1, 2, 3, 4, 5, 6 and 7.

The nib supporting indexer St] is removably secured to the threaded stem portion 16 of the nib it) by a nib locking member having a generally circular locking disc 71 as shown in Fig. 4 from which a tubular shank 72 extends. The tubular shank "1'2 presents inter nal threads 73 by means of which it may be secured as an enclosing sleeve to the threaded stem portion 16 of the nib. The tubular shank 72 is also provided with external threads 74 by which it may be threaded to the internal threads of the tubular tail section 52 of the nib supporting indexer 50. The outer face of the locking disc 72 may be provided with a pair of spaced wrench sockets 75 to which a spanner wrench may be applied when applying and removing the nib 10 from the locking member 70. The locking disc '71 is also provided with a peripheral recess 76 as shown in Fig. 4 which receives the warped spring washer 90.

The nib supporting indexer 50 is rotated in one direction to successive indexing stations by means of the indexing collar 60 contained within the pocket recess 37 of the housing member 30 as shown in Fig. 4. The collar 60 is formed in the shape of a tubular ring as shown in Figs. 2, 3 and 10, presenting a smooth bore 61 through which the tubular tail section 52 of the nib supporting indexer 50 is telescoped. A radial hole 62 extends through the body of the collar 60 to snugly receive the end extension 47 of the indexing handle 45. A semicircular slot 63 is formed in the body wall of the collar 60 and may extend around approximately one-fourth the circumference thereof. A latching lug or pawl 64 is positioned within the semi-circular slot 63 and is mounted on a hinge pin 65 whose ends arejournaled in axially aligned holes 65' formed in the body Wall of the collar as shown in Figs. and 10. The pawl 65 is provided with a nose 66 designed to engage the radial indexing teeth 57 formed in the tubular tail section 52 of the nib supporting indexer50 as shown in Figs. 2 and 3.

The nose 66 of the latchingpawl 64 is resiliently urged into engagement with the radial teeth 57 of the nib supporting indexer 50 by a strong semi-circular spring 67 as shown in Figs. 2 and 3. The main body of the spring 67 is contained within an annular groove 68 formed in the body of the indexing collar 6t) and an end portion of the spring 67 extends into the semicircular slot 63 which contains the pawl 64, one end of the spring 67 terminating in a rounded end portion 69 in resilient bearing engagement with the nose 66 of the pawl 64.

When the indexing handle 45 is swung to the left as shown in Fig. 2, the cover ring 40.will rotate counterclockwise around the tubular body portion 31 of the housing 30, and the indexing collar 60 will also be rotated counterclockwise so that the pawl 64 attached there to will ride over the crown of the indexing teeth 57 formed in the tubular tail section 52 of the nib supporting indexer 50. However, when the indexing handle 45 is swung in a clockwise direction as shown in Fig. 3, the pawl nose 66 will slip into engagement with the adjacent radial tooth 57 of the nib supporting indexer and thus rotate the indexer as well as the nib mounted therein in a clockwise direction.

- A non-rotatable cam washer 80 is positioned between the rear end face of the indexing collar 60 and the adjacent face of the locking disc 71 of the nib locking member 70 and has an axial hole 81 therein so that the washer may be telescoped over the tubular tail section 52 of the nib supporting indexer 50'. The cam washerSti is shaped in the form shown in Fig. 11 and presents a flat face 82 on one side thereof which seats against the adjacent fiat face of the nib locking disc 71. The other face 83 of the washer 80 is provided with diametrically spaced and raised cam faces 84 which match with corresponding diametrically spaced and raised cam faces 85 formed on the adjacent end of theindexing collar 69 as shown in Fig. 10. A pair of diametrically opposed cars 86 project laterally from the cam washer S0 and are designed to slide Within the corresponding longitudinally extending slots in the tubular tail portion 35 of the stationary housing member 30 to thereby hold the cam washer 8i) against rotation. i

A warped spring washer 90 as shown in Fig. 12 having opposite raised rim portions 91 and opposite depressed rim portions 92 is seated in the peripheral recess 76 of the locking member 70 and presses against the adjacent flat face 82 of the cam washer 80. The warped spring washer 90 thus operates to resiliently maintain the raised cam faces 84,0f the axially movable cam washer 80 in resilient contact with the adjacent end face of the indexing collar 60. It will also be noted that the pressure exerted by the warped spring washer 90 against the cam washer 80 is transmitted through the indexing collar 60 to the stationary housing member 30 whose wedge face 34 is thus maintained in bearing contact with the cone shaped cam face 55 of the nib supporting indexer 50.

When one assembles the nib supporting and indexing holder from the parts above described, the tubular body of the nib supporting indexer formed as shown in Fig. 9 is telescoped into the bore 32' of the housingmember 30 as shown in Figs. 7, 8, with theadjacent wedge face 34 of the housing member30 interfitting with the cone shaped cam face 55 of the nib supporting indexer 50. The indexing collar 60 with pawl 64 and semicircular spring 67 attached thereto is telescoped over the tail section 52 of the nib supportingindexer and in surrounding relation to the radial teeth 57 therein. The cam washer is then telescoped over the tail section 52 of the nib supporting indexer with the ears 86 thereof extending into the slots 35' in the tail portion 35 of the housing member 30, and with the raisedcam faces 84 of the washer adjacent the companion raised cam faces of the indexing collar 60. The warped spring washer 96 is then placed within the peripheral recess 76 of the locking member 70 and the external threads 74 provided on the tubular shank 72 thereof then threaded into the internal threads formed in the tail section 52 of the nib supporting indexer.

The cover ring 40 is telescoped over the tubular body 31 of the housing member 30, the indexing handle then applied by threading of the shank portion 46 into the threaded hole 43 in the cover ring 40, with the end extension 47 of the indexing handle 45 inserted into the radial hole 62 in the indexing collar 60. The internally threaded locknut 45 may then be telescoped over the indexing handle 45 and tightened to firmly secure the indexing handle 45 to the cover ring 40. The supporting shank 2i) isattached to the housing member 30- of the tool head by applying the ring nut 25 to the threaded periphery of the head section 22 of the supporting shank 2t) and threading the same onto the external threads formed on the tail portion 35 of the housing member 30. The parts of this holder may thus be easily assembled and disassembled for inspection, repair and replacement of parts.

The diamond supporting nib 10 is mounted within the holder by unscrewing the ring nut 25 so as to release the housing member from the supporting shank 20. The cylindrical neck portion 15 of the nib is then inserted into the smooth inner bore 51 of the nib supporting indexer 5t) and the threaded stem portion 16 of the nib screwed into the internal threads formed in the tubular' shank 72 of the locking member 70. -By holding the locking member 70 against rotation as by applying a spanner wrench to the wrench sockets 75 in the circular locking disc 71 thereof, the nib may be tightened by applying another wrench to the flat faces 18 of the diamond supporting head 11 of the nib. Thus the nib stern may be tightly secured to the nib supporting indexer 5t? and the indexer firmly clamped between the shoulder 11 of the nib head 10 and thehlocking disc 71. The supporting shank 24) may then be applied and secured to the housing member 30 of the holder by means of the ring nut 25.

This improved nib supporting and indexing holder is designed to be mounted on the footstock 104 of a grinding machine 1% whose grinding or polishing wheel N1 is suitably secured to a high speed wheel shaft 162 as diagrammatically shown in Fig. 1. The .footstock 164 of the grinding machine is usually designed to support one end of the Workpieceand to move the workpiece to be ground or polished back and forth in contact with the grinding or polishing wheel 161. The footstock may have a key clamp designed to slide in a clamp slot 106 formed in the work supporting carriage A13. The shank stem 21 of the nib supporting holder may be ad.- justably secured to the footstock 194 of the grinding machine by means of a clamp member 107. The nib holder is so mounted on the footstock 104 so as to place the diamond point 13 of the nib 10 in dressing contact with the surface of the grinding or polishing wheel to be dressed. The diamond pointed nib is thus moved laterally across the face of the wheel during reciprocating movement of the carriage to thereby execute the wheel dressing operation. a

After each stroke of the diamond pointed nib across the operating face of the wheel, the indexing handle 45 may be either manually or mechanically oscillated to present a fresh diamond point to the surface of the wheel to be dressed on the next stroke of the nib across the wheel surface. This indexing adjustment is effected by swinging of the indexing handle 46 in one direction to unlock the nib supporting indexer t) and the nib it? fixedly secured thereto and to simultaneously orient the nib to present a fresh diamond point to the wheel surface. When the indexing handle is thereupon swung back to starting position, the nib 10 and the nib supporting indexer is relocked in fixed adjusted position.

For example, Fig. 2 shows the starting position of the indexing mechanism when the nib it) and the nib supporting indexer 50 is locked in fixed position. In locked position the wedge face 34 of the housing member 39 is tightly wedged against the cone shaped cam face of the nib supporting indexer 50 as shown in Fig. 4, which locking position occurs when the raised cam faces of the oscillatable indexing collar are seated against the raised cam faces 84 of the fixed cam washer 3i: as shown in Fig. 6. The semi-circular slot 36 formed in the stationary housing member 30 is so formed that the end extension 47 of the indexing handle &5 substantialiy abuts againstend stop 36 of the slot when the raised cam faces 34 of the cam washer 86 are in wedging engagement with the companion cam faces 85 of the indexing collar 63 and the wedge face 34 of the housing member 30 thereby wedge-locked against the cone shaped cam face 55 of the the nib supporting indexer St).

When the indexing handle 45 is swung clockwise from its position shown in Fig. 2, the indexing collar 60 is likewise rotated clockwise so as to retract the raised cam faces in the end thereof from the raised cam faces 84 of the cam washer 30, thereby releasing the wedging pressure otherwise exerted by the wedge face 34 of the housing member 30 against the cone shaped cam face 55 of the indexer 50. Upon continued clockwise rotation of the indexing handle 45, the nose portion 66 of the pawl 64 will drop into engagement with the next adjacent radial tooth 57 formed in the tubular body of the nib supporting indexer 50, and the nib supporting indexer 50 and the nib secured thereto thereby rotated in a clockwise direction until further clockwise movement of the indexing handle is prevented by the limit stop 36". Thus when the indexing handle 45 has been swung clockwise from the position shown in Fig. 2 to the position shown in Pig. 3, the nib supporting indexer 5t) and the nib fixedly supported therein will have been rotated to an alternate indexing station so as to present a sharp diamond point for wheel dressing action.

When the indexing handle 45 is swung counterclockwise from the position shown in Fig. 3 to the position shown in Fig. 2, the nose portion 66 of the pawl 64 will ride over the intervening indexing teeth 57 of the nib supporting indexer 50 and the raised cam faces 85 of the indexing collar 6% will thereby be returned into wedging engagement against the raised cam faces 84 of the normally stationary cam washer 8b to thereby wedge-lock the wedge face 34 of the housing member 30 tightly against the internal cone shaped cam face of the nib supporting indexer 50.

While the nib supporting indexer 50 may be provided with any number of equally spaced indexing teeth 57 to provide any desired number of indexing stations, experience has indicated that the provision of seven indexing stations, as illustrated in Figs. 2 and 3 with the diamond point rotated to an alternate station at each indexing adjustment, provide the most statisfactory presentation of a sharper diamond point to the wheel surface to be dressed. Indexing adjustment to alternate stations may be assured by making the slot 36 in stationary housing member 30, through which the indexing handle 45 extends, of such length that when the indexing handle is given an advance and return swing through the full length of the slot as defined by the closed end stops 36 and 36" thereof, the nib supporting indexer 50 will be rotated by the pawl 64 an angular distance corresponding to two indexing stations during the advance swing of the handle 45, and then relocked upon completion of the return swing thereof. Thus, if the indexing stations are consecutively numbered as 1 to 7 as indicated in Figs. 2 and 3, the first indexing adjustment of the diamond pointed nib, as effected by the advance and return swing of the indexing handle for the full length of the slot 36, would be from station 1 to station 3, the second adjustment would be from station 3 to station 5, the third adjustment would be from station 5 to station 7, the fourth adjustment would be from station 7 to station 2, the fifth adjustment would be from station 2 to station 4, the sixth adjustment would be from station 4 to station 6, and the seventh adjustment would be from station 6 to station 1. Thus two complete revolutions of the diamond supported nib would be made during which seven diamond points would have been presented to the abrading wheel and worn down. After seven such indexing adjustments, it is usually found desirable to reset the diamond in the nib or replace the worn diamond with a new one.

This improved nib supporting and indexing holder can be made in a number of different sizes. Thus the holder may be made to support a nib whose diamond supporting head 11 may be only one half inch or less in diameter, with the nib holder being approximately only one inch in diameter, and thence to a size wherein the diamond supporting head is two or more inches in diameter, with the holder measuring three or more inches in diameter. This improved holder is nevertheless compact in construction, and can be used on grinding machines which require the nib holder to be fixedly supported close to the surface of the wheel to be dressed or otherwise set in cramped surroundings. Since the nib stem is rigidly supported over the full length thereof with the nib supporting indexer 50 clamped to the nib stem by the locking member 70, and with the indexer 50 wedge-locked to the housing member 30, any chattering of the nib during wheel dressing operations is positively prevented.

Indexing adjustment of the nib to successive alternate indexing stations is conveniently effected by an advance and return swinging movement of the indexing handle 45 which operates to unlock the nib 10 and the nib supporting indexing holder 50, indexes the nib at the next alternate station, and relocks the nib in indexed position. Thus unlocking and relocking of the nib is automatically effected by a single to and fro oscillation of the indexing handle simultaneously with indexing adjustment of the nib.

All moving parts of the holder are fully enclosed and sealed within the outer housing thereof in a manner to prevent the entry of grinding dust to the internal working mechanism. Thus all moving parts can be oiled and greased when assembled together, with minimum wear on the parts during use.

This improved nib supporting and indexing holder is admirably adapted for association with the footstock of a grinding machine to support the nib at any desired degree of inclination with respect to the surface of the wheel to be dressed. By a simple mechanical attachment, the grinding machine may be provided with trip mechanism (not shown) for effecting the desired indexing oscillation of the indexing handle 45 at the end of each pass of the nib across the face of the wheel being dressed.

It is understood that this invention may be embodied in various modifications and adaptations and is not limited to the particular embodiments described and illustrated, but that various revisions, substitutions and changes may be made by those skilled in the art.

What is claimed is:

l. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting a .9 tapered wedging face and a body section extending from said flange section and presenting a bore designed to receive and support the stern of a wheel dressing nib, means for detachably securing the nib stem within the bore of said indexing member, a housing having a tubular bore snugly receiving and rotatably supporting the body section of said indexing member and a tapered wedging face at one end of said housing interfitting with and complementary to the wedging face of said indexing member, a detachable closure member for closing the other end of said housing, an oscillatablemember, cooperating means contained within said housing and associated with said oscillatable member and the body section of said indexing member operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable member is moved in the advance direction and to disengage said indexing member when the oscillatable member is moved in the return direction, and camming means contained within said housing for axially shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable member.

2. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting an internal cone shaped wedging face and a body section extending from said flange section and presenting a bore designed to receive and support the stem of a wheel dressing nib, means for detachably securing the nib stem within the bore of said indexing member, a housing having a tubular bore snugly receiving and rotatably supporting the body section of said indexing member and an external cone shaped wedging face at one end of said housing interfitting with and complementary to the wedging face of said indexing member, a closure member for closing the other end of said housing, an oscillatable member having means enclosed within said housing and operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable member is moved in the advance direction and to disengage said indexing member when the oscillatable member is moved in the return direction, and camming means contained within said housing for axially shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable member.

3. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting an inner wedging face and a body section extending from said flange section and presenting a bore designed to receive and support the stem of a wheel dressing nib, a locking member for detachably securing the nib stem within the bore of said indexing member, said locking member having a tubular portion threaded within the bore of said indexing member and threaded over a section of the nib stem, a housing having a tubular bore designed to snugly receive and rotatably support the body section of said indexing member and a flange portion at one end of said housing having an external wedging face interfitting with and complementary to the wedging face of said indexing member, a closure member for closing the other end of said housing, an oscillatable member, means contained within said housing and associated with said oscillatable member and body section operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable member is moved in the advance direction and to disengage said indexing member when the oscillatable member is moved in the returndirection, and camming means enclosed Within said housing for axially shifting the wedging face of said indexing' member into and out of wedge locking engage- T10 ment with the wedging face of said housing during the finai return and initial advance movements respectively of 'said oscillatable member.

4. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting a tapered wedging face and a body section extending from said flange section and presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, a locking member for detachably securing the nib stem within the bore of said indexing member, a housing having a tubular bore designed to snugly receive and rotatably support the body section of said indexing member and a flange portion at one end of said housing having a tapered wedging face interfitting with and complementary to the wedging face of said indexing member, a closure member for closing the other end of said housing, an oscillatable collar contained within said housing and telescoped over the body section of said indexing member, pawl and ratchet means associated with said collar and bodysection operative to engage and rotate said indexing member to an advanced indexing station when said collar is moved in the advance direction and to disengage said indexing member when the collar is moved in the return direction, and camming means enclosed within said housing for axially shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable collar.

5. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting an inner cone shaped wedging face and a body section extending from said flange section and presenting a bore designed to receive and support the stem of a wheel dressing nib, a locking member for detachably securing the nib stem within the bore of said indexing member, said locking member having a tubular portion threaded within the bore of said-indexing member and threaded over a section of the nib stem, a housing having a tubular bore designed to snugly receive and rotatably support the body section of said indexing member and a flange portion at one end of said housing having an external cone shaped wedging face interfitting with and complementary to the wedging face of said indexing member, a closure member for closing the other end of said housing, an oscillatable collar contained within said housing and telescoped over the body section of said indexing member, pawl and ratchet means associated with said collar and body section operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable collar is moved in the advance direction and to disengage said indexing member when the oscillatable collar is moved in the return direction, and camming means enclosed Within said housing for axially shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable collar.

6. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section at one end thereof presenting an internal tapered wedging face and a body section extending from said flange section and presenting a bore designed to receive and support the stem of a wheel dressing nib, means for detachably securing the nib stem within the bore of said indexing member, a housing having a tubular bore designed to snugly receive and rotatabiy suppoit the body section of said indexing member and an inwardly flared flange portion at one end of said housing presenting an external tapered wedging face interfitting with and complementary to the wedging face of said indexing member, an oscillatable collar contained within said housing and telescoped over the body section of said indexing member, a closure member for closing the other end of said housing, an elongated slot in said housing, an oscillatable cover ring snugly embracing said housing and covering said elongated slot therein, a manipulating handle fixed to said collar and said cover ring and extending through the elongated slot in said housing, a pawl carried by said collar, and ratchet teeth formed in the body section of said indexing member whereby said indexing member may be rotated to an advanced indexing station when said handle is moved in the advance direction and to disengage said indexing member when the handle is moved in the return direction.

7. A nib supporting and indexing holder including in combination, an indexing member having an outwardly flared flange section pr senting an internal cone shaped \vedging face and a body section presenting a bore ce siged to receive and support the stem of a Wheel dressing nib, means for detachably securing the nib stem within the bore of said indexing member, a housing having a tubular bore designed to snugly receive and rotatably s support the body section of said indexing member and an inwardly flared flange portion presenting an external cone shaped wedging face interfitting with and complementary to the Wedging face of said indexing member, an oscillatable collar contained within said housing and telescoped over the body section of said indexing memher, an elongated slot in said housing, an oscillatable cover ring snugly embracing said housing and covering said elongated slot therein, a manipulating handle fixed to said collar and said cover ring and extending through the elongated slot in said housing, pawl and ratchet means associated with said collar and body section operative to engage and rotate said indexing member to an advanced indexing station when said handle is moved in the advance direction and to disengage said indexing member when i the handle is moved in the return direction, and means within said housing for automatically shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable collar.

8. A nib supporting an indexing holder including in combination, an indexing member having an outwardly fiared flange section presenting a tapered wedging face and a body section presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, means for detachably securing the nib stem Within the bore of said indexing member, a housing having a tubular bore designed to receive and support the body section of said indexing member and a tapered wedging face interfitting with and complementary to the Wedging face of said indexing member, an oscillatable collar telescoped over the body section of said indexing member having means operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable collar is moved in the advance direction and to disengage said indexing member when the oscillatable collar is moved in the return direction, and means for automatically shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable collar, said shifting means including a nonrotatable cam plate telescoped over the body section of said indexing member and positioned adjacent the end face of said oscillatable collar, and complementary cam portions extending from adjacent faces of said cam plate and oscillatable collar.

9. A nib supporting and indexing holder including in combination, an indexing member having a outwardly flared flange section presenting a tapered wedging face and a body section presenting a bore designed to receive and support the stem of a wheel dressing nib, a locking member for detachably securing the nib stem within the bore of said indexing member, said locking member having a tubular body portion threaded within the bore of said indexing member and threaded over a section of the nib stem and a disc portion extending from said tubular portion, a housing having a tubular bore designed to snugly receive and support the body section of said indexing member and a flange portion presenting a tapered wedging face interfitting with and complementary to the wedging face of said indexing member, an oscillatable collar telescoped over the body section of said indexing member having means operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable collar is moved in the advance direction and to disengage said indexing member when the oscillatable .collar is moved in the return direction, and means for automatically shifting the wedging face of said indexing member into and out of wedge locking engagement with the wedging face of said housing during the final return and initial advance movements respectively of said oscillatable collar, said shifting means including a cam platc telescoped over the body section of said indexing member and positioned between the disc portion of said locking member and the adjacent end face of said oscillatable collar, and complementary cam portions extending from adjacent faces of said cam plate and oscillatable collar, said cam plate having projecting ear portions extending into conforming slots in said housing holding said cam plate against rotation.

10. A nib supporting and indexing holder including in combination, an indexing member having a tubular body section presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, a housing member having a tubular body receiving and rotatably supporting the body section of said indexing member, said housing member and indexing member having overlapping flange portions at one end thereof presenting in- 'terfitting and complementary contact faces for closing one end of said housing member, a supporting shank having a head section closing the other end of said housing member, a ring nut detachably securing the head section of said supporting shank to said housing member, means contained within said housing member for detachably securing the nib stem within the bore of said indexing member, an oscillatable member contained within said housing member, said oscillatable member and the body section of said indexing member having cooperating means operative to rotate said indexing member to an advanced indexing station, an elongated slot 'in said housing, an oscillatable cover ring snugly embracing said housing member and covering said elongated slot, and a manipulating handle fixed to said oscillatable member and said cover ring and extending through the elongated slot in said housing member.

11. A. nib supporting and indexing holder including in combination, an indexing member having a tubular body section presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, a housing member having a tubular body presenting a bore designed to snugly receive and rotatably support the body section of said indexing member, said housing member and indexing member having overlapping flange portions at one end thereof presenting interfitting and complementary contact faces for closing one end of said housing member, a sup porting shank having a head section closing the other end of said housing member, a ring nut detachably securing the head section of said supporting shank to said housing member, means contained within said housing member for detachably sscuring the nib stem Within the bore of said indexing member, an oscillatable collar contained within said housing member and embracing the body section of the indexing member, said oscillatable collar and body section having cooperating pawl and ratchet means operative to rotate said indexing member to an advanced indexing station, an elongated slot in said housing, an oscillatable cover ring snugly embracing said housing and covering said elongated slot, and a manipulating handle fixed to said oscillatable collar and said cover 13 ring and extending through the elongated slot in said housing member.

12. A nib supporting and indexing holder including in combination, a normally stationary housing member, a supporting shank, a ring nut detachably securing said supporting shank in saidlhousing member, an indexing member having a tubular body portion extending into said housing member and designed to receive the stem of a wheel dressing nib, means for detachably securing said indexing member to the nib stem, spaced indexing teeth extending around the tubular body portion of said indexing member, an indexing collar contained within said housing member and in surrounding relation to the tubular body portion of said indexing member, a handle part connected to and extending outwardly from said collar through a slot in said housing member, a pawl element mounted on said collar positioned to selectively engage the indexing teeth of said indexing member and rotate the nib and indexing member to an advanced indexing station when said collar is moved in an advance direction and to disengage said indexing member when said collar is moved in a return direction, overlapping flange portions presenting interfitting and complementary wedging faces forming a part of said housing member and said indexing member for releasably locking said indexing member and nib in indexed position, and cam means for axially shifting said indexing member to thereby automatically disengage said wedging faces when said collar is moved in the advance direction and to reengage said wedging faces when said collar is moved in said return direction.

13. A nib supporting and indexing holder including in combination, an indexing member having a tubular body section presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, a housing member having a tubular body receiving and rotatably supporting the body section of said indexing member, said housing member and indexing member having overlapping flange portions at one end thereof presenting interfitting and complementary contact faces for closing one end of said housing member, closure means for closing and sealing the other end of said housing member, means contained within said housing member for detachably securing the nib stem within the bore of said indexing member, an oscillatable member contained within said housing member, said oscillatable member and body section of said indexing member having cooperating means operative to rotate said indexing member to an advanced indexing station, an elongated slot in said housing, an oscillatable covering member embracing said i 14 housing member and covering said elongated slot, and a manipulating handle fixed to said oscillatable member and said covering member and extending through the elongated slot in said housing member.

14. A nib supporting and indexing holder including in combination, an indexing member having a tubular body section presenting a bore designed to snugly receive and support the stem of a wheel dressing nib, a housing member having a tubular bore receiving. and rotatably supporting the body section of said indexing member, said housing member and indexing member having overlapping end portions at one end thereof presenting interfitting tapered wedging faces for closing one end of said housing member, closure means for closing and sealing the other end of said housing member, means contained within said housing member for detachably securing the nib stem within the bore of said indexing member, an oscillatable member contained within said housing member, cooperating means associated with said oscillatable member and the body section of said indexing member operative to engage and rotate said indexing member to an advanced indexing station when said oscillatable member is moved in the advance direction and to disengage said indexing member when the oscillatable member is moved in the return direction, an elongated slot in said housing member, an oscillatable covering member snugly embracing said housing member and closing said elongated slot, at manipulating handle fixed to said oscillatable member and said covering member and extending through the elongated slot in said housing member, and means contained within said housing for axially shifting the wedging face of said indexing member into and out of wedge looking engagement with the wedging face of said housing member during the final return and initial advance movements respectively of said oscillatable member.

References Cited in the file of this patent UNITED STATES PATENTS 431,855 Simpson July 8, 1890 2,233,858 Tree Mar. 4, 1941 2,319,895 Walker May 25, 1943 2,333,939 Kreimborg Nov.- 9, 1943 2,375,114 Kylin May 1, 1945 2,466,199 Berthiez Apr. 5, 1949 2,505,684 McClernon Apr. 25, 1950 FOREIGN PATENTS 553,026 Great Britain May 5, 1943 

